Our maps are designed so that you can download the map to a smartphone before losing cell signal and then travel into an area where there might not be any cell signal and the app then utilizes just the GPS function of your phone to show you exactly where you are on our map! No more messing around with GPS units and trying to figure out what to do with all of that data and turn it into some kind of usable map....we've sorted all of that out for you. Just go and have fun! You can learn more on our about us page.